JB/T 6134-1992 Technical requirements for hydraulic cylinders for metallurgical equipment (PN ≤ 25MPa)
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6134-1992
Hydraulic Cylinders for Metallurgical Equipment
(p≤25MPa)
Technical Conditions
Published on June 9, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Hydraulic Cylinders for Metallurgical Equipment
(pN≤25MPa)
Technical Conditions
1 Subject Content and Scope of Application
JB/T 6134-1992
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of hydraulic cylinders for metallurgical equipment. This standard applies to JB2162 and JB/ZQ4395 hydraulic cylinders (hereinafter referred to as hydraulic cylinders) for metallurgical equipment with a nominal pressure of PN ≤ 25 MPa, an ambient medium temperature of -20~+80℃, and a working medium of mineral hydraulic oil. 2 Reference standards
GB2348
GB2349
GB2350
GB2878
GB4879
GB/T13306
JB/ZQ4000
JB/ZQ4286
JB/JQ4235
JB/JQ20502
JB2162
JB/ZQ4395
3 Technical requirements
Hydraulic and pneumatic systems and components Cylinder diameter and piston rod outer diameter Series Hydraulic and pneumatic systems and components
Cylinder Piston stroke series
Hydraulic and pneumatic systems and components
Piston rod thread type and size series
Hydraulic and pneumatic systems and components
Oil (gas) port connection thread size
Rust-proof packaging
General technical conditions
General technical conditions for packaging
Regulation for the use of signs
Methods for testing the internal cleanliness of hydraulic components Weighing method Types and sizes of hydraulic cylinders for metallurgical equipment (p≤16MPa) Types and sizes of hydraulic cylinders for metallurgical equipment (p≤25MPa) 3.1 Hydraulic cylinders shall comply with the requirements of this standard and be manufactured according to drawings and technical documents approved by the prescribed procedures. The piston speed of the hydraulic cylinder shall be as specified in Table 1. 3.2
Inner diameter of hydraulic cylinder, mm
Piston speed, mm/s
3.3Performance
>80-125
3.3.1No-load operationWhen the test is carried out according to 4.3.1, the piston movement should be smooth and the minimum starting pressure should not exceed the provisions of Table 2. 3.3.2Load operationWhen the test is carried out according to 4.3.2, the piston movement should be smooth and there should be no abnormal phenomenon such as creeping. 3.3.3Internal leakageWhen the test is carried out according to 4.3.4, the internal leakage of the hydraulic cylinder should not exceed the provisions of Table 3. Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on June 9, 1992, and implemented on January 1, 1993
Piston seal type
Nominal pressure P%
Piston rod seal type
Hydraulic cylinder inner diameter
Internal leakage
JB/T6134—1992
Hydraulic cylinder inner diameter
Note: When using a combined seal, the internal leakage shall not exceed twice the value in the table. 3.3.4
External leakage
More than 0.002d
Internal leakage
Hydraulic cylinder inner diameter
mL/10min
Internal leakage
The total amount of oil leakage at the piston rod dust ring should not be greater than when tested according to Article 4.3.5, when the piston moves a distance of 100m, and other parts shall not leak oil.
Note: d is the piston rod diameter, mm.
Load efficiency When tested according to Article 4.3.6, the load efficiency of the hydraulic cylinder shall not be less than 90%, and the load efficiency shall be calculated as follows::
Where: 2
Load efficiency of hydraulic cylinder:
Output force of hydraulic cylinder, kN;
Pressure acting on the piston surface, MPa;
Effective area of piston, cm2.
×100%
Pressure resistance When tested according to Article 4.3.7, no loosening, permanent deformation, parts damage and other abnormal phenomena shall occur. When tested according to Article 4.3.8, the hydraulic cylinder shall be able to work normally. High temperature resistance
Durability
3.4 Structure
When tested according to Article 4.3.9, no loosening, permanent deformation, abnormal wear and other phenomena shall occur. 3.4.1
1 Various parts of the same cylinder diameter produced by the same manufacturer must be interchangeable, and the performance must not change significantly due to the replacement of parts.
3.4.2 The structure of the hydraulic cylinder should be as simple and applicable as possible, and have reliable buffer and air release devices. The connection between the piston rod and the piston must be firm. 3.5 Dimensions and precision
3.5.1 The inner diameter of the cylinder and the diameter of the piston rod shall comply with the provisions of GB2348, and their finishing dimension tolerance and cylindricity shall comply with the provisions of Table 4, and shall be selected according to GB1801 and GB1184 respectively. Table 4
Inner diameter of cylinder mm
Diameter of piston rod mm
Fine machining dimension tolerance
Cylindricity
JB/T6134-1992
The surface roughness of the inner surface of the cylinder, piston rod, piston, and sliding surface of the guide sleeve shall comply with the provisions of Table 5. Table 5
Inner surface of cylinder barrel
Sliding surface of piston rod
Surface roughness R
Sliding surface of piston
Sliding surface of guide sleeve
The piston stroke shall comply with the provisions of GB2349, and its deviation shall comply with the provisions of Table 6. Table 6
≤100
>100250
>250~630
>630~1000
>1000~1600
The verticality of cylinder barrel end face and cylinder head mounting face to the axis shall comply with Grade 8 specified in GB1184. μm
Surface roughness R
3.5.5The verticality of the end face of the piston to the axis shall comply with Grade 8 specified in GB1184; the coaxiality of the sliding surface of the piston to the axis shall comply with Grade 8 specified in GB1184.
The fit between the inner surface of the cylinder and the sliding surface of the piston is H8/f8. The fit between the guide sleeve (or the part equivalent to the guide sleeve) and the sliding surface of the piston rod is H8/f8. The type and size of the front end connection thread of the movable rod shall comply with the provisions of GB2350. The oil port connection thread shall comply with the provisions of GB2878. 3.6
Processing quality
The processing quality of the hydraulic cylinder shall comply with the relevant provisions of JB/ZQ4000. 3. 6. 2
The quenching and tempering hardness of the piston rod is 241~286HB, the sliding surface quenching hardness is 42~45HRC, the chrome plating thickness of the sliding surface is 0.03~0.05mm, and the hardness of the chrome layer is 800~1000HV. The plating must be smooth and delicate, and there must be no defects such as peeling, shedding or blistering. 3.7 Assembly quality
The assembly quality of the hydraulic cylinder shall comply with the relevant provisions of JB/ZQ4000. Before assembling, all parts should be cleared of burrs and carefully cleaned. The dust rings and seals are not allowed to have any abnormalities such as scratches, distortion, curling or falling out.
The internal cleanliness of the hydraulic cylinder must be less than that specified in Table 7. Table 7
Inner diameter of cylinder, mm
Weight of foreign matter, mg
80~100
Note: The stroke is calculated as 1m. For every additional 1m, the weight of foreign matter is allowed to increase by 10%. 125~160
200~250
3.7.4 The exposed oil port of the hydraulic cylinder should be covered with an oil-resistant dust cover, and the exposed threads of the piston rod and other connecting parts should be covered with protective sleeves. Test method
The test device should be a flat device based on a horizontal or vertical foundation. The tested hydraulic cylinder (hereinafter referred to as the tested cylinder) should be installed with a support method that is compatible with the form of its supporting part. a, see Figure 1 for the case of using a loading cylinder.
Load cylinder
b, see Figure 2 for the case of using a heavy object.
Guide support
JB/T6134-1992
Shaft joint
Test cylinder
Hydraulic system schematic diagram for hydraulic cylinder test
a See Figure 3 for the no-load action test circuit;
b, See Figure 4 for the loaded action test circuit.
Pressure gauge
Huankang.com
Single meat fly
Dirty power meter
Motor
Safety rate week
Test cylinder
Support gravity.
Change line
Test platform
Heavy hammer center of gravity
Medical force&
Flow surface section
Region of national N
Yiyourun
Pressure device
4.2 Test conditions
4.2.1 Test oil
a. The oil temperature is stipulated as 50℃±5℃;
JB/T6134-1992
b. The oil viscosity grade is stipulated as VG32 or VG46; c. The solid pollution grade of the oil is not more than 19/16.4.2.2 The piston speed shall be in accordance with the provisions of Table 1, and can also be agreed upon by the supply and demand parties. 4.3 Test items
4.3.1 No-load operation The tested cylinder shall be tested for 5 times on the full stroke under no-load conditions. 4.3.2 Loaded operation Set the test circuit pressure to the nominal pressure and apply the load. Move the cylinder more than 5 times at the lowest and highest speeds in Table 1 at the full stroke. When the stroke of the cylinder under test is particularly long, the position of the loading cylinder can be changed, and the loaded test operation can be carried out in sections over the full stroke.
4.3.3 Minimum starting pressure During the test in 4.3.1, gradually apply pressure from the rodless side and measure the minimum starting pressure of the piston. 4.3.4 Internal leakage Fix the piston of the cylinder under test at both ends of the stroke (when the stroke is greater than 1m, it must also be fixed in the middle), apply the nominal pressure on one side of the piston, and measure the internal leakage on the other side of the piston. 4.3.5 External leakage During the tests in 4.3.1, 4.3.2, 4.3.4, 4.3.7, and 4.3.9, measure the external leakage at the piston rod dust ring. 4.3.6 Load efficiency Adjust the overflow valve to gradually increase the pressure on the rodless side of the cylinder under test, measure the load efficiency under different pressures, and draw the load curve.
4.3.7 Pressure test Apply 1.5 times the nominal pressure Pn (when pN>16MPa, it should be 1.25 times) to the rodless side and rod side of the cylinder under test, respectively, and keep the piston at both ends of the stroke, and maintain the pressure for 2 minutes for testing. 4.3.8 High temperature test Under full load conditions, the cylinder under test is passed through 90℃±3℃ oil, and the test is carried out for more than 1h of continuous operation. 4.3.9 Endurance test Under full load conditions, the piston of the cylinder under test is continuously operated at the maximum speed specified in Table 1 ±10%, and the continuous operation time shall not be less than 8h. The piston moves a distance of 150km, and the parts of the cylinder under test shall not be adjusted during the test. 4.3.10 Full stroke inspection During the test in 4.3.1, the piston is stopped at both ends of the stroke and the full stroke length is measured. It should meet the design requirements and the provisions of Table 6.
5 Inspection rules
5.1 Basic rules
Hydraulic cylinders must be inspected and qualified by the quality inspection department according to this standard before they can be shipped out of the factory, and accompanied by product qualification documents. 5.2 Factory inspection
5.2.1 Factory inspection is carried out according to 4.3.1, 4.3.3, 4.3.7, 4.3.10 of this standard, and 4.3.4 and 3.7.3 are sampled by batch. 5.2.2 The internal cleanliness test of hydraulic cylinders shall be carried out according to the provisions of JB/JQ20502. 5.2.3 The number of random inspections of hydraulic cylinders is 2% of each batch of products, but shall not be less than 2 units (pieces). If there are unqualified items in the random inspection, the item shall be doubled for re-testing. If there are still unqualified items, the whole batch of products shall be inspected. 5.3 Type inspection
5.3.1 Type inspection shall be carried out in accordance with Article 4.3 of this standard. Products used for type inspection must be selected from products that have passed the factory inspection. 5.3.2 The number of type inspections is stipulated as 3 units (pieces), one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified items in the inspection, the item can be doubled for re-testing. If there are still unqualified items, the hydraulic cylinder type inspection is unqualified. 5
JB/T6134—1992
5.3.3 Type inspection shall be carried out before the hydraulic cylinder is put into production, and when changes in design process and materials affect the performance of the product. 5.4 For special-order hydraulic cylinders, the inspection items shall be agreed upon by the supply and demand parties. Marking, packaging, transportation and storage
6.1 Marking
The hydraulic cylinder label design should be beautiful and elegant, with clear characters, and should comply with the provisions of GB/T13306 and JB/ZQ4235. 6.1.2
Fix the label in an obvious and appropriate position on the hydraulic cylinder shell. The label should indicate: a. Product name and model; b. Main technical parameters (pressure, cylinder diameter, stroke, etc.); manufacturer name; d. Factory date and number. The outer wall of the hydraulic cylinder packaging box should clearly indicate: a. Product name, specification model, weight; b. Receiving unit, destination; c. Shipping unit; d. Rainproof, no inversion, and lifting symbols. 6.2
The packaging of the hydraulic cylinder should be firm and reliable, and have shockproof and moisture-proof measures. The packaging of hydraulic cylinders shall comply with the relevant provisions of JB/ZQ4286 and GB4879. The hydraulic cylinders are packed in wooden boxes (except for special circumstances), which should ensure that the products will not be damaged during normal transportation. The following documents should be placed in the hydraulic cylinder packaging box: a. Product certificate;
b. Instructions for use.
During transportation, it is strictly forbidden to bump and hit, and the packaging box must not be deformed or damaged. It is strictly forbidden to be exposed to rain. 6.4 Storage
a. Hydraulic cylinders should be stored in a dry and ventilated place; b. The storage period of hydraulic cylinders is one year from the date of shipment. Additional remarks:
This standard was proposed and managed by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Second Heavy Machinery Plant and Jiaozuo Hydraulic Machinery Plant. The main drafters of this standard are Tan Zhaomei and Zhao Wei. 6
People's Republic of China
Mechanical Industry Standard
Hydraulic Cylinders for Metallurgical Equipment
(pN≤25MPa)
Technical Articles
JB/T 61341992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 5/8
Word Count 12,000
First Edition in June 1992
First Printing in June 1992
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_96 Load efficiency Adjust the overflow valve to gradually increase the pressure on the rodless side of the cylinder under test, measure the load efficiency under different pressures, and draw the load curve.
4.3.7 Pressure test Apply 1.5 times the nominal pressure Pn (when pN>16MPa, it should be 1.25 times) to the rodless side and rod side of the cylinder under test, respectively, and keep the piston at both ends of the stroke, and maintain the pressure for 2 minutes for testing. 4.3.8 High temperature test Under full load conditions, the cylinder under test is passed through 90℃±3℃ oil, and the test is carried out for more than 1h of continuous operation. 4.3.9 Endurance test Under full load conditions, the piston of the cylinder under test is continuously operated at the maximum speed specified in Table 1 ±10%, and the continuous operation time shall not be less than 8h. The piston moves 150km, and the parts of the cylinder under test shall not be adjusted during the test. 4.3.10 Full stroke inspection During the test in 4.3.1, the piston is stopped at both ends of the stroke and the full stroke length is measured. It should meet the design requirements and the provisions of Table 6.
5 Inspection rules
5.1 Basic rules
Hydraulic cylinders must be inspected and qualified by the quality inspection department according to this standard before they can be shipped out of the factory, and accompanied by product qualification documents. 5.2 Factory inspection
5.2.1 Factory inspection is carried out according to 4.3.1, 4.3.3, 4.3.7, and 4.3.10 of this standard, and 4.3.4 and 3.7.3 are sampled by batch. 5.2.2 The internal cleanliness test of hydraulic cylinders shall be carried out according to the provisions of JB/JQ20502. 5.2.3 The number of random inspections of hydraulic cylinders is 2% of each batch of products, but shall not be less than 2 units (pieces). If there are unqualified items in the random inspection, the item shall be doubled for re-testing. If there are still unqualified items, the whole batch of products shall be inspected. 5.3 Type inspection
5.3.1 Type inspection shall be carried out in accordance with Article 4.3 of this standard. Products used for type inspection must be selected from products that have passed the factory inspection. 5.3.2 The number of type inspections is stipulated as 3 units (pieces), one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified items in the inspection, the item can be doubled for re-testing. If there are still unqualified items, the hydraulic cylinder type inspection is unqualified. 5
JB/T6134—1992
5.3.3 Type inspection shall be carried out before the hydraulic cylinder is put into production, and when the changes in design process and materials affect the performance of the product. 5.4 For special-order hydraulic cylinders, the inspection items shall be agreed upon by the supply and demand parties. Marking, packaging, transportation and storage
6.1 Marking
The hydraulic cylinder label design should be beautiful and elegant, with clear characters, and should comply with the provisions of GB/T13306 and JB/ZQ4235. 6.1.2
Fix the label in an obvious and appropriate position on the hydraulic cylinder shell. The label should indicate: a. Product name and model; b. Main technical parameters (pressure, cylinder diameter, stroke, etc.); manufacturer name; d. Factory date and number. The outer wall of the hydraulic cylinder packaging box should clearly indicate: a. Product name, specification model, weight; b. Receiving unit, destination; c. Shipping unit; d. Rainproof, no inversion, and lifting symbols. 6.2
The packaging of the hydraulic cylinder should be firm and reliable, and have shockproof and moisture-proof measures. The packaging of hydraulic cylinders shall comply with the relevant provisions of JB/ZQ4286 and GB4879. The hydraulic cylinders are packed in wooden boxes (except for special circumstances), which should ensure that the products will not be damaged during normal transportation. The following documents should be placed in the hydraulic cylinder packaging box: a. Product certificate;
b. Instructions for use.
During transportation, it is strictly forbidden to bump and hit, and the packaging box must not be deformed or damaged. It is strictly forbidden to be exposed to rain. 6.4 Storage
a. Hydraulic cylinders should be stored in a dry and ventilated place; b. The storage period of hydraulic cylinders is one year from the date of shipment. Additional remarks:
This standard was proposed and managed by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Second Heavy Machinery Plant and Jiaozuo Hydraulic Machinery Plant. The main drafters of this standard are Tan Zhaomei and Zhao Wei. 6
People's Republic of China
Mechanical Industry Standard
Hydraulic Cylinders for Metallurgical Equipment
(pN≤25MPa)
Technical Article
JB/T 61341992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 5/8
Word Count 12,000
First Edition in June 1992
First Printing in June 1992wwW.bzxz.Net
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_96 Load efficiency Adjust the overflow valve to gradually increase the pressure on the rodless side of the cylinder under test, measure the load efficiency under different pressures, and draw the load curve.
4.3.7 Pressure test Apply 1.5 times the nominal pressure Pn (when pN>16MPa, it should be 1.25 times) to the rodless side and rod side of the cylinder under test, respectively, and keep the piston at both ends of the stroke, and maintain the pressure for 2 minutes for testing. 4.3.8 High temperature test Under full load conditions, the cylinder under test is passed through 90℃±3℃ oil, and the test is carried out for more than 1h of continuous operation. 4.3.9 Endurance test Under full load conditions, the piston of the cylinder under test is continuously operated at the maximum speed specified in Table 1 ±10%, and the continuous operation time shall not be less than 8h. The piston moves 150km, and the parts of the cylinder under test shall not be adjusted during the test. 4.3.10 Full stroke inspection During the test in 4.3.1, the piston is stopped at both ends of the stroke and the full stroke length is measured. It should meet the design requirements and the provisions of Table 6.
5 Inspection rules
5.1 Basic rules
Hydraulic cylinders must be inspected and qualified by the quality inspection department according to this standard before they can be shipped out of the factory, and accompanied by product qualification documents. 5.2 Factory inspection
5.2.1 Factory inspection is carried out according to 4.3.1, 4.3.3, 4.3.7, and 4.3.10 of this standard, and 4.3.4 and 3.7.3 are sampled by batch. 5.2.2 The internal cleanliness test of hydraulic cylinders shall be carried out according to the provisions of JB/JQ20502. 5.2.3 The number of random inspections of hydraulic cylinders is 2% of each batch of products, but shall not be less than 2 units (pieces). If there are unqualified items in the random inspection, the item shall be doubled for re-testing. If there are still unqualified items, the whole batch of products shall be inspected. 5.3 Type inspection
5.3.1 Type inspection shall be carried out in accordance with Article 4.3 of this standard. Products used for type inspection must be selected from products that have passed the factory inspection. 5.3.2 The number of type inspections is stipulated as 3 units (pieces), one of which is subject to full-item inspection, and the rest are only subject to performance inspection. If there are unqualified items in the inspection, the item can be doubled for re-testing. If there are still unqualified items, the hydraulic cylinder type inspection is unqualified. 5
JB/T6134—1992
5.3.3 Type inspection shall be carried out before the hydraulic cylinder is put into production, and when the changes in design process and materials affect the performance of the product. 5.4 For special-order hydraulic cylinders, the inspection items shall be agreed upon by the supply and demand parties. Marking, packaging, transportation and storage
6.1 Marking
The hydraulic cylinder label design should be beautiful and elegant, with clear characters, and should comply with the provisions of GB/T13306 and JB/ZQ4235. 6.1.2
Fix the label in an obvious and appropriate position on the hydraulic cylinder shell. The label should indicate: a. Product name and model; b. Main technical parameters (pressure, cylinder diameter, stroke, etc.); manufacturer name; d. Factory date and number. The outer wall of the hydraulic cylinder packaging box should clearly indicate: a. Product name, specification model, weight; b. Receiving unit, destination; c. Shipping unit; d. Rainproof, no inversion, and lifting symbols. 6.2
The packaging of the hydraulic cylinder should be firm and reliable, and have shockproof and moisture-proof measures. The packaging of hydraulic cylinders shall comply with the relevant provisions of JB/ZQ4286 and GB4879. The hydraulic cylinders are packed in wooden boxes (except for special circumstances), which should ensure that the products will not be damaged during normal transportation. The following documents should be placed in the hydraulic cylinder packaging box: a. Product certificate;
b. Instructions for use.
During transportation, it is strictly forbidden to bump and hit, and the packaging box must not be deformed or damaged. It is strictly forbidden to be exposed to rain. 6.4 Storage
a. Hydraulic cylinders should be stored in a dry and ventilated place; b. The storage period of hydraulic cylinders is one year from the date of shipment. Additional remarks:
This standard was proposed and managed by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Second Heavy Machinery Plant and Jiaozuo Hydraulic Machinery Plant. The main drafters of this standard are Tan Zhaomei and Zhao Wei. 6
People's Republic of China
Mechanical Industry Standard
Hydraulic Cylinders for Metallurgical Equipment
(pN≤25MPa)
Technical Articles
JB/T 61341992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 5/8
Word Count 12,000
First Edition in June 1992
First Printing in June 1992
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_94 Storage
a. Hydraulic cylinders should be stored in dry and ventilated places; b. The storage period of hydraulic cylinders is one year from the date of delivery. Additional remarks:
This standard was proposed and managed by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Second Heavy Machinery Plant and Jiaozuo Hydraulic Machinery Plant. The main drafters of this standard are Tan Zhaomei and Zhao Wei. 6
People's Republic of China
Mechanical Industry Standard
Hydraulic Cylinders for Metallurgical Equipment
(pN≤25MPa)
Technical Article
JB/T 61341992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 5/8
Word Count 12,000
First Edition in June 1992
First Printing in June 1992
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_94 Storage
a. Hydraulic cylinders should be stored in dry and ventilated places; b. The storage period of hydraulic cylinders is one year from the date of delivery. Additional remarks:
This standard was proposed and managed by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Second Heavy Machinery Plant and Jiaozuo Hydraulic Machinery Plant. The main drafters of this standard are Tan Zhaomei and Zhao Wei. 6
People's Republic of China
Mechanical Industry Standard
Hydraulic Cylinders for Metallurgical Equipment
(pN≤25MPa)
Technical Articles
JB/T 61341992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Sheet 5/8
Word Count 12,000
First Edition in June 1992
First Printing in June 1992
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_9
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